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Why is this rock hard?

ShellyRock2.jpg

A. The Sun baked the material in the rock, causing the material to harden

B. Water exerted pressure on the material in the rock, causing the material to harden

C. The material in the rock was buried, causing the material to harden

D. Water mixed with the material in the rock, causing the material to harden



bold = correct answer

Question Identifier: GCI_2011_095
Designed for: Non-Science
Primary Author(s): J. Libarkin, S. Anderson
Contributing Author(s): C. Steffke
Misconception's Reference: Original GCI (https://www.msu.edu/~libarkin/GCI_PUBLICATIONS.html)